Make An ESRI Map

Make a Map—The Make a Map feature includes a simple interactive Web map showing seven different U.S. demographic layers. Visitors can zoom in to an area of interest, select a demographic layer, then embed the map into their own Web pages simply by copying and pasting the automatically generated HTML for free map services.





Quick to embed, limited datasets and seems to be USA only (datawise).
(Even geo-locates Area 51 above)

Make your map here

Related
http://www.esri.com/software/mapping_for_everyone/index.html

source:
http://www.esri.com/news/releases/09_4qtr/mapping-for-everyone.html